Ship hoist



July 1o, 19.51 A, SLATER 2,559,832

SHIP HOIST Filed Aug. 25, 1946 4 Sheets-Sheet l N k l J \I R *le R 2% ms z u Sg Q a m R Ri m M A. SLATER July l0, 1951 SHIP HOIST Filed Aug.23, 194e` 4 Sheets-Sheet 2 A. SLATER SHIP HOIST July 10, 1951 4Sheets-Sheet 3 Filed Aug. 25, 1946 .July i0, 1951 A. sLATx-:R 2,559,832

SHIP HOIST Filed Aug. 23, 1946 4 Sheets-Sheet 4 Patented July 10, 1.951

UNITED STATES PATENT OFFICE SHIP HOIST Alexander Slater, West SaintKilda, Victoria, Australia Application August 23, 1946, Serial No.692,526

This invention relates to ships gears for the loading and unloading ofships cargo, and of the type including derrick control gear and hoistinggear.

It is generally conceded that the derrick and hoisting gear included inall classes of ships is quite inadequate for the expeditious handling ofthe cargo, due mainly to the fact that the gear has become more or lessobsolete having regard to the modern tendency towards mechanisation toeliminate unnecessary manual labour.

For example, a considerable amount of manual labour is still involved inthe handling of the cargo in the hold of the ship and the control o'fthe derricks, necessitating the employment of a considerable number ofstevedores,` to position the cargo where it can be connected to thehoisting cables. This is due primarily to the practice of effectingcontrolled movement of the derrickor yard arm which terminates theinward swing in substantially the same position above the hold,

whereby cargo not located substantially therebelow requires to bemanhandled to bring the same to the hoisting cable. Moreover, to attachto the cargo in slings or the like to the hoistingv cable vit is againnecessary to manually handle the cargo for the slinging or thesuspending of the same on the hoisting cable which adds considerably tothe time and labour involved.

` Incidentally, manual adjustment of the derrioks to position the samein the loading and unloading position causes delays during operation.

Obviously the above method of handling the cargo and hoisting gear addsto the time at which a-ship -is required toremain at the wharf fordischarging and loading cargo, with resultant heavy cost to the shipowners in wharfage rates and stevedoring costs.

il 'Now this invention has as its principal object to avoid theabovestated disadvantages by the provision of efficient and convenientlyoperable derrick control and hoisting gear by the use ofwhich manuallabour and handling of cargo is reduced to a minimum, i. e. the handlingof the cargo is practically mechanised..

A further object of the invention is to provide derrick control andhoisting gear that may be conveniently set or adjusted to permit thecargo to be loaded and unloaded from either side of` the ship.

1 A further object of the invention is to provide such derrick controland hoisting gear, by thei use of which the cargo may be expeditiouslyunloaded or loaded to Vsubstantially reduce the time and number ofstevedores normally involved in 17 Claims. (Cl. 212-3) the handling ofthe salme cargo whereby the ship may quickly clear the port.

With the above stated objects in View there is provided according tothis invention, an iml proved derrick for the unloading and loading of'cargo comprising power actuated topping gear `for each one of a pair ofcoacting booms to adjust the working inclination of said booms, and me-nchanical locking means operatively associated with each topping gear tomaintain the booms`v in the adjusted working inclination.

The coactive booms between which the load is swung, i. e. the midshipbooms operating above the hold and the yard arm booms operating abovethe wharfare normally maintained xed in their respective positions atthe required workthe four booms and mast of a ship.

Fig. 1 is a semi-diagrammatic view in side elevation of a ships mast andcontrol geagfor the` booms as viewed from the starboard or port side.

Fig. 2 is a similar plan of the apparatus and y gear shown in Fig. 1. f

Fig.' 3 is -a similar end elevation (looking aftl' of the apparatus.

Figures 4 and 5- are diagrammatic elevations of a pair of boomsillustrating the distant -or lazy guys and winch control for the latter.

Fig. 6 is a fragmentary perspective view illus-` trating the toppinggear for each boom andassociated locking gear. v v i l Fig. '7 is asectional elevation of locking gear,: illustrated in Fig. 6.

Fig. 8 is a section on the line 8-8 of Fig. 7. Fig. 9 is a perspective-of a modified arrange#v ment of the locking gear, illustrated in Figs.7 8..

^ Referring to Figs. 1 and 2 the pairs of booms. 4, 5, 6 and 'I in theform of jib arms are pivot-fally mounted for universal movement invtheir sockets 8 uponfthe lower table 9 and-grouped'. about the mast 9a,which extends through ther table 9 and is iittedv with a top table l intheA conventional manner. The gear .controlling the.:

rear booms 6-1 excepting the main cargo hoist, being omitted in Fig. l,for the purpose of clearly illustrating the gear on the front pair ofbooms 4-5.

Referring at the outset to the topping gear for angularly moving eachboom through the vertical plane from the horizontal to the substantiallyvertical, this movement is effected under motive power at the control ofau operative to eliminate manual handling To that end, said gear in eachinstance comprises a span wire I I anchored at one end to the collar I2upon the upper end of the boom 4-5 in Fig. l and extends to a guidepulley I3 upon a projecting plate I4 upon the` top table I0 of the mastfrom which pulley the wire II travels to an equalizing pulley I5 andreturns parallelly to the anchorage point I6 on the plate I4 to form abight span.

As viewed in Fig. 6 equalizing pulley I5 is journalled in a shackle Il'to one side of which is attached the down haul cable I8, passing aboutthe idler pulley l9, upon the deck 29 of the ship to a topping drumcoaxial with and driven from the shaft of the main hoisting steam winch22.

Topping drum 20 is carried upon the shaft 23 clutch coupled as at 23a tothe shaft of the winch 22 whereby upon the manipulation of the clutchhandle 24 said drum may be driven in unison with the main drum of thewinch. Upon being declutched the topping drum 2U may be expeditiouslystopped and rendered idle by application ofthe brake 25. Y

The other side of the shackle I1 has connected thereto a dependinglocking chain 21 which passes into a bell mouthed guide tube 28 mountedon the deck 29 adjacent to the stauncl'iions 36 of the lower table 9.The guide tube28 is vertically disposed above a chain housing 30amounted below the deck and in which the locking chain 21 coils as theboom is angularly raised or topped` and pays out as the boom issimilarly lowered towards the horizontal.

The locking gear co-operating with the chain 21 is illustrated in Figs.6 to 8 and comprises a horizontal pin 3I slidable in the channeled guide32 mounted upon the standards 33 upon the deck 2.9, to enter anYaperture 34 in a flat surface 34a upon the guide tube 23, adiametrically opposite aperture 35 being covered by the hinged flap 36.

Pin 3l is attached to an aligning rack member 31 carried in and axiallymovable relatively to the vertical frame 38 mounted upon the deck 29.

Guide brackets 39 disposed in alignment with thechanneled guide 32constrain the rack member 31 to move in an axial path and similarly movethe pin 3 l.

11 The rack member 31 is channeled with the teeth 31a flush with'thesurface thereof to pass freely through the guide brackets 39.

Disposed in constant mesh with the teeth 31a is a pinion 40 carried upona spindle 4I journalled in the frame 38 and footstep bearing 39a. Acontrol hand wheel 42 is fitted to the upper end of the spindle 4I, theturning of the wheel in one complete revolution being adapted to eitheradvance the pin 3I into the locking position 'ici 4 seats upon theparticular hanging link 21a of the locking chain 21 and extendingthrough the diametrically opposite aperture in the guide tube 28 bridgesthe latter to thereby restrain movement of and lock said chain 21. Byrestraining and locking the chain 21 against movement, the boom 4 isretained fixed in the required position angularly to the horizontal, i.e. its top is disposed at the required height above the level of thehold of the ship.

A stop d5 upon the rack member 31 limits the retractive movement of thelatter, and the detachable pin 46 insertable through the aligningapertures l1 in the central handle 42 and frame 38Y retains the rack andpin 3l against movement in the operative locking position of the latter.

To ensure self-centering or adjustment of the pin 3| in the apertures34-35 of the guide tube 28 to engage the link of the chain 21, the pin3| is divided as at 3Ia fand the sections pivotally connected wherebythe outer section may readily feed through said apertures.

In the operation of the topping gear described to raise the boom 4, Fig.l from the horizontal to the topped position at an angle ofapproximately 45 to the horizontal, the operative, with the locking pin3l retracted and disengaged from the locking chain 21, disengages thebrake 25 and by adjustment of clutch handle 2li clutch couplesv thetopping drum 20 to the winch 22.

Rotation of the topping drum 20 exerts a downwardly directed pull uponthe cable I8 which is transmitted through the equalizing pulley I5 tothe span wire I I which pulls upon the top ofthe boom and angularlyraises the latter to the position illustrated.

As the boom 4 is raised the locking chain 21 feeds through the guidetube 28 into the chain housing 30a as the equalizer pulley I5 islowered. and upon the boom being moved to the required angularadjustment illustrated, the winchman declutches the topping drum 23,applies the brake 25 and then operates the control wheel 42 to engagethe locking pin 3l with and retain the locking chain 21 in the lockedposition as illustrated in Fig. 6.

The boom 4 is then locked in the required inclination to the horizontalwithout obviating thev swinging or slewing movement to determine theexact position of the boom in the loading or unloading positionrelatively to the hold 49 of the ship or the wharf as hereinafterdescribed.

As illustrated in Fig. 9 the apparatus for locking the chain 21 may besuitably modified to t Within a relatively narrow area in smaller ships.

To that end the locking pin 3I is supported in parallel disposition andattached to the rack member 31 by the cross member 49a, so as to move inunison with the latter upon the turning of the control wheel 42.v

- Referring now to Fig. 2 it will be observed that each boom 4, 5, G and1 is provided with the topping gear and associated locking mechanism,the Winches 22 being disposed in transverse and longitudinal alignment,on the 'deck about the veniently operate either one of the toppinggearsy and locking gear associated with a particular pair of booms.

With the boom e. g. 4, Fig. 1 locked at the required inclination to thehorizontal, it may beswung or slewed to positively locate the top of the'51- boom above the required location in the hold, or the wharf forloading or unloading purposes.

To that end each boom 4 5, 6 1 as viewed in Fig. 1 has anchored to thecollar I2 thereon, one end 50a. of a substantially V-shaped guy wire,indicated generally at 50, the upper section of the guy wire beingconnected to the upper one of a pair of double sheave equalizing blocks52 coupled by running lengths of the guy wire, forming one side of theV-formation.

The lower sheave block `52 has an extension 53 of the wire, forming theother side of the V- formation, leading upwardly to and passing aroundan idler pulley 54 mounted upon a separate plate 55 on the top table l0,from which pulley the wire extension 53 extends downwardly through guideroller 56 on the mast 9a to the guide 51 which directs said wire 53below and under lower table 9 to a separate winch 58 mounted upon thedeck. All four Winches 58 are grouped together in alignment below thelower table 9 as viewed in Fig. 2.

In this position the guy Winches 58 (there is one for each boom) areclear of the topping drums 20 and Winches 22. Connecting the shackle ofthe lower sheave block 52 is a downwardly inclined extension or cable 69extending to an adjusting deck anchorage 60a.

As illustrated in Fig. 2 the V-shaped guy wire 50 for each boom projectsoutwardly from and is inclined downwardly relative to the booms, withthe anchorage cables 60 disposed in effect substantially midway betweenthe ends of the outer booms and the idler pulleys 54.

Accordingly with the anchorage point 60a. constant, upon the winch 58being energized, the pull exerted by the guy wire 53 is transmittedthrough the equalizing pulleys 5| 52 to the outer end of the boom,causing the latter to travel angularly about or slew relatively to itssocket 8 without effecting any variation in its previously adjustedinclination to the horizontal.

This slewing movement is effected under the control of the distant orlazy guy gear which couples a pair of twin yard arm and midship booms 41 or 5 6 and will now be described With reference to booms 4 1 in Figs.1 and 2.v

wardly directed purchase cable 65 running paral-` lel to the boom 1 andleading to the winch 66 disposed upon the deck 29 below the lower table9 at one corner thereof.

As viewed in Fig. 2 there is a winch 66 disposed at the other diagonalcorner of the lower table 9, the booms 5 6 being coupled by the lazy guywire 6| as hereinbefore described and as illustrated in Figs. 1 and 2. Y

In Fig. 4 the booms 4 1 are illustrated in the fully topped position,and Fig. 5 shows the boom 4 in an operative position and a horizontalposition respectively in response to the operation of the llazy guy andother control gear previously described.

The length of the guy span wire 6| in conjunction with the extensiblecable from the winch 66, relative to the length of the booms is suchthat a full range of angular and slewing movement may be imparted toeither boom as indicated by the positions of the boom 1 in Fig. 5.

. AThe winch 66 is used to raise the boom `1 from the lowered positionand to lower or swing the boom, the brake on the winch is released topermit the weight of the boom to cause the paying To achieve such anadjusted position of one of the coupled booms, either the lazy guy orthe slewing gear is slackened oil and one of the control winches ofthese gearsenergized to haul the freed boom in a slewing motion to therequired position whereby manual adjustment and hauling is eliminated.

To facilitate'the manoeuvering and handling of the cargo within thehold, particularly heavy and cumbersome cargo, suchV as steel or longtimbers, there is provided a preliminary lift gear for each boomoperating over the hold, for the purpose of initially moving, separatingand rais-v ing the load in the hold to a position at which it can beattached to and raised by the main hoist associated with booms.

Accordingly the manhandling usually necessary to move the cargo to themain hoist is eliminated with attendant reduction in labour and safetyof the men operating in the coniines of the hold 49.

The lift gear comprises a hoisting cable 1n depending from a pulleyblock 1| near the top of the boom and extending spanwise to an idlerguide pulley 12 upon the mast 9a, from which pulley the cable extendsdownwardly for connection to an electric winch 15 located rearwardly ofthe lower table 9, as illustrated in Fig. 2. Although the lift gear isonly applied to the booms 4 5 operating over the hold (i. e. the midshipbooms), as illustrated in Fig. 2, the other booms 6 1 (i. e. the yardarm booms) have mounted thereon the pulley blocks 1| and a further pairof guide pulleys 12 are disposed in spaced relation thereon, to permitrthe lift gear to be removed frorn the former booms 4 5 and applied tothe latter booms 6 1 when the ship is to be loaded from the oppositeside.

A messenger cable 16 shown in the attached position, is tted to thecable 1U adjacent the book 11 of the latter to permit the lift cable 10to be slipped when the load has been hauled to and taken up by the maincargo hoist 19 included with each boom for elevating fromthe hold.

Within the hold the lift cable 10 can be drawn to the selected areatherein and attached to the load and upon the winch 15 being energized,the load is moved up to and attached to the main hoist 19, therebyeliminating the manhandlingv of the cargo within the hold 49.

The main hoist 19 comprises a cable depending from a sheave block uponthe vcollar |2 of the boom and projecting substantially parallelly withthe boom to the guide pulley 83 on the lower table 9 from which saidcable leads to the drum 8| of the main steam winch 22.

In operation each pair of booms 4 1 and 5 6 are adjusted by the toppinggear, slewing gear and lazy guys to assume the required position -abovethe hold 49 and wharf respectively, i. e.'

the midship booms4 5 are disposed at `the `re-j` quired height andposition above the. hold, andy yardarm booms 6-1 are similarly disposedover the wharf.

As above described the loadis initially carried bythe lift cable l tothe main hoist cable 'I9 of boom il, which then takes over the load, towhich latter is also connected the main hoist cable 19 of the coactiveboom 1 as illustrated in Fig. 1.

lThe main hoist cable I0 of the boom 'l is ini.- tially slackened oi butthe slack isv reduced as the cargo is raised by the main cable 19 of theboom s until a predetermined. height andclearance is reached, at. whichthe cargo then swings between the booms and the weight is graduallytaken over by said cable on the boom 1 :from which the load is loweredto the wharf.

AccorclingljT it will be understood that as the booms 4-1 remain nxed inthe adjusted position the cargo maybe. expeditiously unloaded withoutthe requirement of continuously adjusting the booms and if. suchadjustment is required it is simply eiTected under the motive power ofthe Winches and labour in the handling ofthe cargo within the hold isreduced to a minimum by the lift` gear which initially lifts and carriesthe cargo to the midshipbooms 4-5 operating over the hold.

Y Iv claim:

Y, l.. A derrick construction for loading and unloading ships cargocomprising a mast, a pair of coactive booms associated with the mast,cargo hoisting gear included with each boom, a power actuated distant orlazy guy gear connecting the pair of booms, power actuating slewing gearconnecting each boom for swinging the latter to an operative position,said power actuatable gears cooperative to normally maintain the boomsin relatively fixed loading -or unloading positions, power` actuatedtopping gear operatively connecting each boom to adjust the workinginclination of said boom, and mechanical locking means coa active withthe topping gear to maintain the adjusted working inclination yof eachboom.

. 2. A derrick construction for loading and unloading ships cargocomprising a mast, a pair of coactive booms associated with the mast,cargo hoisting gear included with each boom, a power actuated distant orlazy guy gear connecting the pair of booms, power actuatable slewinggear connecting each boom for swinging the latter to an operativeposition, said power actuatable gear cooperative to normally maintainthe booms in` relatively fixed loading or unloading positions, poweractuated topping gear operatively connecting each boom to adjust theworking inclination of said boom, mechanical locking means coactive withthe topping gear to maintain the adjusted working inclination of theboom, and preliminary lifting gear incorporated with each boom toinitially raise and deliver the cargo within the hold of the ship to beraised by the, booms.

` 3. A derrick construction for loading and unloading ships cargo,comprising a mast, a pair ofcoactive booms associated with the mast, cargo hoisting gear included with each boom, power actuated topping gearoperatively .connecting each boom to adjust the working inclination ofsaid booms, said topping gear comprising a cable anchored to the outerend of the boom and extending through a bight span in the cable lto ananchorage point on the mast, a pair of flexible extensions connectingthe bight span, a winch connecting one of said iiexible connections, andmechanical locking means engageable with the other ilexible extension tomaintain the boom in the adjusted working inclination.

'LAV derrickfconstruction for loading and uri-f loading ships cargo,comprising a mast, a, pair' of4 coactive booms associated with the mast,cargo hoisting gear includedwith each boom, power actuated toppinggear-operatively connecting eachage point on the mast adjacent the upperpulley,

a down haul cable attached to the equalizing pulley, a winch or windingdrum connecting the down haul cable, a chain attached to the equalizingpulley, and mechanical locking means en-A gageable with the chain tomaintain the boom in the adjusted working inclination.

5. A derrick construction for loading and un-L loadingships cargo,comprising a mast, a pair of.,

coactive booms, associated with the mast, cargo hoisting gear includedwith each boom, power actuated topping gear operatively connecting eachboom to adjust the working inclination of said topping gear comprising acable anchored to,V the outer end of the boom and extending through abight span in the cable to an anchorage point. on the mast, a pair offlexible extensions con-- necting the bight span, a down haul cable attached to the bight span, a winch or winding drum connecting thedownhaul cable, a chainv attached to the bight span, a tubular chainguide through which the chain is passed, said guidehaving aligningapertures, a pin mounted -for axial movement perpendicularly to said.guide tubein alignment with the apertures, and manually operablemeansfor moving said pin to project through the apertures to bridge a linkinsaid chain within the tubular chain guide,

6. A derrick construction for loading and unloading ships cargo,comprising a mast, a pair of coactive booms associated with the mast,cargo hoisting gear included with each boom, power actuated topping gearoperatively connecting each .boomto adjust the working inclination of.

said booms, said topping gear comprising a pulley on the mast, anequalizing pulley at a lower level upon the mast, a cable extending in aspan from the upper pulley to an anchorage point upon the end. of theboom, and downwardly to andV re turnedabout the equalizing pulley to ananchor"-E age point on the mast adjacent the upper pulley, a down haulcable attached to the equalizingv pulley, a winch or winding drumconnecting the down haul cable, a chain attached to the equalizirigpulley, a tubular chain guide through whichj the chain is passed, saidguide having aligning apertures, a pin mounted for axial movementperpendicularly to said guide tube in alignment with the apertures, andmanually operable means for moving said pin to project through theapern'Y tures to bridge a link in said chain within the tubular chainguide,

7. A derrick construction for loading and un-l loading ships cargo,comprising a mast, a pair of coaotivebooms associated with the mast,cargo hoisting gear included with each boom, power actuated topping gearoperatively connecting each boom to adjust the working inclination ofsaid booms, said topping gear comprising a cablel haul cable attached tothe bight span, a'winch or winding drum connecting the down haul cable,a chain attached to the bight span, a tubular chain guide through whichthe chain is passed, said guide having aligning `apertures, a pinmounted for axial movement perpendicularly to said guide tube inalignment with the apertures, a toothed rack member operativelyconnecting said pin, a pinion in mesh with the rack member, and manuallyoperable means for rotating the pinion so as to move the rack member andadvance the pin through the aligning apertures to bridge a link of thechain within the tubular chain guide.

8. A derrick construction for loading and unloading ships cargo,comprising a mast, a pair of coactive booms associated with the mast,cargo hoisting gear included with said boom, power actuated topping gearoperatively connecting` each boom to adjust the working inclination ofsaid booms, said topping gear comprising a pulley on the mast, anequalizing pulley at a lower level upon the mast, a cable extending in aspan from the upper pulley to an anchorage point upon the end of theboom, and downwardly to and returned about the equalizing pulley to ananchorage point on the mast adjacent the upper pulley, a down haul cableattached to the equalizing pulley, a winch or winding drum connectingthe down haul cable, a chain attached to the equalizing pulley, atubular chain guide through which the chain is passed, said guide havingaligning apertures, a pin mounted for axial movement perpendicularly tosaid guide tube in alignment with the apertures, a toothed rack attachedto and disposed in alignment with the pin, a support in which thetoothed rack is slidably mounted, a spindle journalled in the support, apinion carried upon the spindle to mesh with the rack, and manuallyoperable means for rotating the spindle so as to move the rack memberand advance the pin through the aligning apertures to bridge a link ofthe chain within the tubular chain guide.

9. A derrick construction for loading and unloading ships according toclaim 7, and wherein the toothed rack member is parallelly disposed tothe Din, a slide forming the guide for the pin, and a transverse memberattached to one end of said rack member and one end of the pin.

10. A derrick construction for loading and unloading ships according toclaim 7, wherein the tubular chain guide comprises a bell mouthed tubemounted upon the deck of the ship, and a chain housing below said chainguide.

11. A derrick construction for loading and unloading ships cargo andaccording to claim 1, wherein the power actuated distant or lazy guycomprises a cable anchored at one end to the outer end of one of thebooms and extending through a bight span to an anchorage point adjacentthe outer end of the other boom, a down haul cable connected to thebight span of the cable, and a winch attached to the other end of thedown haul cable.

12. A derrick construction for loading and unloading ships cargo andaccording to claim 1, wherein the power actuated distant or lazy guycomprises a cable anchored to the outer end of one of the booms, apulley upon the outer end of the other boom, an inner or lowerequalizing pulley, said cable extending to and passing about said pulleyand equalizing pulley to return to an l0 anchorage point on the boomadjacent to the first mentioned pulley, a down haul cable attached tothe equalizing pulley, and a winch attached to the end of the other endof the down haul cable.

13. A derrick construction for loading and unloading ships cargo andaccording to claim l and wherein the power actuated slewing gearcomprises a winch, a guy wire having one end attached to the winch, aring upon the mast through which a cable is passed and extended in asubstantially V-shaped extensible span to connect the top of a boom, anda cable connected to said span and to an anchorage upon the deck of theship.

14. A derrick construction for loading and unloading ships cargo andaccording to claim 2, and wherein the preliminary lifting gear comprisesa winch, a hoisting cable leading oi'the winch, a pulley upon the mastto which the hoisting cable is guided, a pulley upon the boom to whichthe cable extends to extend downwardly in parallelism with the cargohoisting cable associated with said boom.

15. A derrick construction for loading and unloading ships cargo andaccording to claim 2 wherein the preliminary lifting gear comprises awinch, a hoisting cable leading off the winch, a pulley upon the mast towhich the hoisting cable is guided, a pulley upon the boom to which thecable extends to extend downwardly in parallelism with the cargohoisting cable associated with said boom, and a messenger cableconnectable to the hoisting cable.

r16. A derrick construction for loading and unloading ships cargo,comprising a mast, a pair of coactive booms associated with the mast,cargo hoisting gear included with each boom, power actuated topping gearoperatively connecting each boom to adjust the working inclination ofsaid boom, a depending chain connecting the topping gear, a tubularchain guide throughv which the chain is passed, said guide havingaligning apertures, a pin mounted for axial movement perpendicularly tosaid guide tube in alignment with the apertures, and manually operablemeans for moving said pin to project through the apertures to bridge alink in said chain within the tubular chain guide.

17. In a derrick construction for loading and unloading ships andaccording to claim 4, a winch included with the cargo hoisting gear, awinding drum on said winch connected to the down haul cable, and clutchmechanism controlling the operation of the separate winding drum.

ALEXANDER SLATER.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 138,215 Walsh Apr. 22, 1873528,734 McPherson Nov. 6, 1894 655,707 Haynes Aug. 14, 1900 1,094,005Miner Apr. 21,1914 1,287,057 Lutz Dec. 10, 1918 1,706,441 Daughs Mar.26, 1929 2,222,066 Brown Nov. 19, 1940 2,354,182 Christoffersen July 25,1944

